<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./testcss.css">
</head>
<body>


<div class="bgr">
    
<div class="one">不平铺</div>
<div class="two">水平平铺</div>
<div class="three">垂直平铺</div>

</div>
</body>
</html>